Projection apparatus



July 23, 1940.` P. KRUPNIK PROJECTION APPARATUS Filed Feb. v26. 1938 3Sheets-Sheet 1 July 23, 19.40. v P KRUPNIK 2,208,944 A PROJECTIONAPPARATUS Filed Feb. 26, 193B 3 Sheets-Sheet 2 July 23, 1940. P. KRUPNIKPROJECTION APPARATUS Filed Feb. 26, 1958 3 Sheets-Sheet 3 j?? ye/afofPatented July 23, 1940 UNITED STATES.

PATENT OFFHCE4 6 Claims. l(Cl. 884928) The invention relatestoprojection apparatus. and particularly to projection apparatus wherebyalong iilm, bearing legends or symbols, is continuously moved across thesurface of a screen to 5 exhibit such legends or symbols.

It is an object of the invention to provide an apparatus whereinextremely long lms may be used and effectively moved for displaypurposes.

Another object is the provision of novel film 10 feeding mechanism foreiiiciently moving the iilm in either direction.

Agstill further object constitutes the provision oi means formaintaining the portion of the film for projection in tautconditionfwithout damage thereto.

Another object constitutes a superior cooling system for the iilm andlamp housing.

A still further object is the provision of an air cooling for the filmportion through which the 2o light rays pass for projection.

' It is also an object of the invention to provide certain details ofconstruction and arrangement tending to enhance the utility and emciencyof a device of the character described,

With these and other equally important objects in view, which willbecomeapparent from a vperusal of the invention, the latter comprises themeans described in the following specification, particularly pointed outin the claims forming a part thereof, and illustrated in theaccompanying drawings, in which:

Fig. l is a plan view of a sign projecting apparatus constructed inaccordance with my in.

vention. Fig. 2 is a section on the line 2-2 of Fig. i.

Fig. 3 is a section on the line 3-3 of Fig. l.

Fig. 4 is a section on the line 6 4 of Fig". 2.

Fig. 5 is an enlarged section on the line 5 5 oi Fig. 2.

40 Fig. 6 is a perspective view of an auxiliary frame.

Referring to the several views in the drawings, IIl designates a baseplate, on which is mounted a casing I9 comprising front and rear wallsIi and I2, respectively, side walls I3 and I6, and a cover I5, hingedlyconnected to the rear wall II and provided with a plurality of holes i6for the escape of air.

A false bottom .I1 in the cover, provided with a central slot I8, actsas a diverter.

A lamp box 20, having aligning openings 2|, for the passage of lightrays, is provided in the casing and surrounds a lamp 22, mounted in asocket 23. secured to the base plate III.

5s A reilector 25 is secured to the rear wall Ii,

opposite the openings 2 i, to reect rays forwardly..

To the front wall II is secured, in alignment with the openings 2i, atubular member 25, delning an opening 2l in the front wall and having a-pair oi condensing lenses 2B. 5

A pair of horizontal rods 29, 3B extend into the Ycasing I9 and aresecured therein by extending through a bearing member 3l (Fig. l) andsecured thereto by a set screw 32.

Adjacent the tubular member a vertical parl0 tition, generallydesignated by 33, having integral standards 34', bent at right angles atthe lower end and secured to the base by a screw 35.

The partition has a horizontal ange 36 at the top and aligninghorizontal anges il'l near i5 the bottom, provided with bearing lugs3&3, in which is journaled a horizontal rod 39. The anges 3i haveapertures for the passage of the rods 29, 3d, respectively.

An auxiliary frame or gate, generally designated by do, is pivotallysecured to 'the rod 3Q by lugs 38, having apertured trunnions 42, inwhich the rod 3s is received.

The auxiliary frame ri, at each side, is recessed and provided withvertically aligning bearings t3 and 4d, in which is received shafts 45and d6, respectively, carrying rollers fl'i and 48, res pectively.

The auxiliary frame is provided with a longitudinal slot d'9 which is inalignment with a siot 3@ 5t in the partition 35i, whereby the light raysemanating from the lamp 22 may pass without obstruction.

Lugs 5i, just above and below the slot 49, are provided for a purposehereinafter referred to. 85

The auxiliary frame has a lug 52, extending` upwardly from the top andadapted to engage the partition flange 36 under the influence of aspring 53, secured at one end to the auxiliary frame 4G, as at 54, whileits other end is anchored to a screw c 55, projecting from the partition33. Y

Slidably mounted on the rods 29, 3d is a carrlage 5@ in which isadjustably held a tube 5l having a cam` slot 58, receiving the end of aset screw fand provided with a projecting lens 6U. 45

On the base plate il) are mounted electric motors ti and 62, which drivethe lm moving mechanism, therebelng a switch 63 for turning on and offthe motors, as well as a rheostat control Si, for controlling the speedof the motors. 50

The motors 6i and 62 drive, respectively, fan blowers 65 and 66 (Fig. 3)mounted in housings 61, whence a duct 68 leads through the centralcasing i9 and enters the lamp box 20 to cause currents of cool air topass along the lamp 22,

A and escape upwardly through the holes in the m partition 33, and aresecured thereto by a screw Awidened to permit the .film to be wound in a81 and 88 to form the loops 15.

Therear portion of the housing is supported on a standard 13, secured atthe lower end, to the base plate |0,by a screw 1d.

The housing 69V is formed at the front and sides as a U-shaped trough,but, at the rear, is

series of loops 15 around four rollers 16, 11, 18 and 19, which aremounted on a raised bottom portion 80, sloping rearwardly anddownwardly, and the innermost layer of the loops 15 is drawn underneaththe loops and passes under a roller 9 I, arranged in slanting positionto reach a roller 62. The loops are in nested relation and in engagementwith one. another. f

' The film then proceeds past rollers 83 and 8d, past a film feedingdevice presently to be de'- scribed, to rollers 85 yand 86, reachingrollers The housing is closed by a cover 69a releasably secured thereto,in any approved or convenient manner.

The film feeding device includes vertical shafts 89 and 90, journaled inthe fianges 36 and flanges 31, each carrying a pair of sprockets 9| and92, respectively, having teeth 93, which engage apertures 96 of thefilm, to positively feed the samey as hereinafter further described.

'I'he shafts 89 and 90 are also provided at the top with sprocket wheels95 and 96, around which a chain 91 is trained, so that irrespective ofwhether shaft 89 or 90 receives the drive, the non-driven shaft ispositively driven by the chain 91. At the lower end of the shafts 89 and90 are bevel gears 98 and 99, respectively.

A horizontal shaft |00 is journaled in bearings IBI and I 02, providedon the partition standards 34, and has slidably 4mounted thereon asleeve |03, provided with bevel gears |09 and |05,

which are adapted to be placed in'mesh with' bevel gears 98 and 99,respectively, so that the film may be driven toward the left or right.

The shaft |00 is connected by a reduction gearing |06, to the motor 62,to be driven thereby. It is evident that when, as shown in Fig. 2, thesleeve |03 is `in the extreme left position, and secured by a set screw|01, drive is imparted to the shaft 89. The shaft 90 and its sprockets92 do not idle, however, since the chain 91 drives the shaft 90, so thatpositive feeding of the film is obtained by both pairs of sprockets 9|and 92. From the housings 61 lead ducts |08 and |09, to a distributorhead IIO, located on the base plate I0 just in front of the partition33, so as to permit air to reach the film in the feeding mechanism, tomaintain the same in cool condition.

Attention is called to the fact that that portion of the film, stretchedbetween the sprockets draw cold air from the atmosphere and lcircu-Vlate the same through the casing and past the film portion, which isheld taut for projection.

The film housing 69 has additional rollers III and I|2, which may beused instead of the rollers BI and 8B, in the event the loops are to beformed from the `right instead of the left, as viewed in Fig. 1.

. The raised portion is recessed, as at 80a, to permit the innermostlayer to pass freely under the nested loops.

The partition 33 is provided with a handle ||3, tofacilitate handling-ofthe device.

I'he film moving mechanism is designed to.

obtain eiiicient movement of the film and to this end the lug 52 of theauxiliary frame engages 'the flange 36 of the frame 33, whereby therollers v41, 48 are always maintained at a proper distance from thesprockets to obviate pressure on the film.

While thedrawings show a preferred embodiment of the invention, numerouschanges, alterations and revisions may be made without departing fromthe spirit of the invention.

I, therefore, do not limit myself to the 'details of construction, asshown, but Wish'to include all modifications, revisions and changes,constituting 'departures within the scope of the invention, as definedin the appended claims.

-I claim:

1. In a projecting apparatus, a film moving mechanism for conveying afilm past a projecting aperture, comprising a frame having upper andlower horizontal flanges, a pair of vertical shafts journaled in saidflanges and carrying sprockets engaging the lm, an auxiliary frameprovided with rollers and hinged to said lower horizontal fianges, saidauxiliary frame having a projecting aperture, and resilient means urgingsaid auxiliary frame into position to cause its rollers to cooperatewith said sprockets in moving said `film.

2. In a projecting apparatus, a film moving .mechanism for conveying afilm past a projecting aperture and comprising an upright frame havingan upper and lower horizontal flange and provided with a projectingaperture, a pair of vertical shafts journaled in said flanges andcarrying sprockets engaging the film, a horizontal shaft journaled inbearings on said frame, means for selectively gearing said horizontalshaft to one of said pair of vertical shafts, and means for impartingdrive from said geared vertical shaft to the ungeared vertical shaft.

3. In a projecting apparatus, a film moving mechanism for conveying afilm past a projecting aperture and comprising an upright frame havingan upper and lower horizontal flange, said frame having a projectingaperture, a pair of vertical shafts journaledin said flanges andcarrying sprockets engaging the film, a horizontal shaft journaled inbearings on said 'frame below said vertical shafts, means forselectively gearing said horizontal shaft to one of said pair auxiliaryframe hingedly connected to said lower horizontal ilangey and carryingrollers to cooperate with sprockets, said auxiliary frame being providedwith a projecting aperture, and means for urging said auxiliary frametoward said upright frame.

5. In a projecting apparatus, a film moving mechanism for conveying afilm past a projecting aperture and comprising an upright frame havingan upper and lower horizontal flange, a pair of vertical shaftsjournaled in said anges and carrying sprockets engaging the film, ahorizontal shaft journaled in bearings on said frame, means forselectively gearing said horizontal shaft to one of said pair ofvertical shafts, an auxiliary frame hingedly connected to said frame andcarrying rollers to cooperate with said sprockets, said auxiliary framebeing provided with a projecting aperture, means for urging saidauxiliary toward said upright frame, and means for maintaining saidrollers at a predetermined distance from said sprockets. .Y l

6. In a projecting apparatus, a film feeding device for conveying a lmpast a projecting aperture including a support, sprocket rollers on saidsupport for indexing said film, an apertured plate pivotally secured tosaid support provided with a projecting aperture and having rollerscooperating with said sprockets in guiding the lm, said plate havinglugs engaging the film intermediate said sprocket wheels to maintain itin taut condition, and means for limiting the extent to which saidrollers approach said sprockets to prevent pressure on the film.

PHILLIP KRUPN'IK.

